Warning: file_put_contents(/www/wwwroot/ppbbu/laei.cn/cache/a94823100b9a83a1fe5ec4511f7e4f93.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/laei.cn/index.php on line 58 Coelli例句_Coelli英汉例句_Coelli双解例句_按摩法牛津词典
We adopt Battese and Coelli's (1995) model of stochastic frontier function and apply the software Frontier4.1 to evaluate the cost inefficiency score. 研究发现，研发支出与成本效率呈正相关关系，即研发支出越多，成本效率越高。